Object of the present invention is a relatively simple structure to achieve particularly effective cooling in high temperature turbine engine components in the turbine nozzle. Radial turbine according to the present invention, the turbine housing cover turbine nozzle (2) and a radial turbine wheel (3) and forming a combustion gas (10 → 11 → 12 → 13) flow passage (15, 16) (5) outward, it is formed with the compressed air prior to combustion (20 → 21) a flow passage (24) of the turbine housing (7) of the double-shell structure. The compressed air before combustion airtight compressed air flow flowing through the channel between the atmosphere (21), penetrating through the through hole wall surface of the turbine housing two fierce blowing turbine nozzle (51). In this way, while cooling the turbine nozzle, the compressed air used in cooling the nozzle to the turbine wheel flows in the results, will be injected into the compressed air turbine (20) of the turbine wheel as a driving all mechanical work.